Telephone



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Patented Get. 23,71923.

unire star retranscrire.

JOSEPH KAY, or s'roenron'r, `ann contri annuliens, or LONDON, ENGLAND, nssionons 'ro rnnivirnn rnivnrri TELEPHONE contraria, Liiarrnn, yor stroonronr,

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TELEPHONE.

appiication inea tramites, mi. seriai no. Masse.

To all whom it may concern.'

Be -it known that we, Josnrn KAY, a subject of the King of England, residing at Edgeley, Stockport, Cheshire, England, and JOHN JnNNiNGs, a subject of the' Kingjof England, residing at Plumstead,`Londo n, 18, England, have invented Vcertain newv and, useful improvements in Telephones, oi which the following is a specili-k cation. y

This invention ,is yfor improvements in or relating to telephones and has for one of its objects to provide amore convenient ar,- rangement of the mechanism in inter-communication telephone sets. Y t

According to the primary feature of the invention an inter-'communication telephone table instrument is provided which is shaped to resemble an ordinary pedestal table instrument having the transmitter ixed yto its standard, but which has a base (preferably circular) within the casing` of which are house ringing and speaking bars "forming part of the telephone wiring system, togetliei" with plunger selector switches' to cooperatetherewith, said selector switches projecting through the casing to the outside thereof for finger operation, and being preferably circularly Varranged about the stand ard. f

According to another feature of the in-y vention 'an inter-communication telephone instrument of the type in which selector switches displace a speaking barto pass therethrough to Contact a ringing bar, is

characterized kin that the speaking bar is mounted to move circularly between guiding studs (for example studs supporting the' ringing bar from the casing of the base oit' the instrument) situated on both sidesof it.

Accordingto a further feature of the finvention an inter-communication telephone instrument of the type in which selector` switches Adisplace a speaking bar to pass rtheretlirough to Contact a ringing bar. and are subsequently automatically retained in the depressed position by the speaking bar, is characterized by the provision oil a clearing plunger (for example similar in Ashape to the aforesaid plunger selector switches), independent of the switch lever tor the telephone receiver, which plunger projects through the casing of the base similarly toi the selector switches and is adapted to be operated displace the speaking bar to release any` selector switches held depressed 'For a'moie complete understanding of the rinvention there willl now be described, by

way of. example only and witli'reference to the accompanying drawings, certain constructions of Vtable instrument according to kthe invention. t is to be-under'stood. however, th'at the'invention is not limited lto the' precise constructional details set forth.

vFigure 1 is a partial 'elevation of table instrument. This igure is partly in section, one of the sections being taken on the line 1--1 of Figure 2 Figure 2 is a plan partly in section on the line 2 2 oft Figure 1;

ligure 3 is a detail view of a modification, an VFigure 4 is a diagrammatic view of a portion of the wiring. y

Like reference numerals indicate like parts throughout'tlie drawings.-

The instrument comprises a hollow circular baselO, andl a tubular standard k11 projecting upwardly vtherefroimtlie transmitter 12 being mounted at the top or" the standard 11, while projecting transversely from the upper part of tlie standard is a switchyleve'r 13 the outeripart of which is formed as a hook 1e on which to hang the receiver 15. ,The instrument thus is ot' the same general appearance as an ordinary table or desk telephone instrument of the Candlestick type.- Projecting through the upper surface oi 'its base, however, are

tenses plunger selector switches 16 which are cir-` 'Y Thesel switches 16 may be oic any desired number according to the number ot instru-M 2 instrument and so on. This arrangement Y is not essential but will generallybe/found desirable in actual practise for convenience in setting up the systems and lreeping'them inorder. kThe selector switches 16 each lcomprise a rod 17 mounted to slide in an aper-k Acularly arranged around Vthe standard 11a l' side the base the Yie ture in the upper surface of the base 10, one end of the rod projecting -into the interior ofthe base and the other remaining outside the base.` This latter end of the rod is formed with a'suitable button whereby the switch may be finger operated, while inrods carry at their ends conical caps k18 whereof the base which is larger in diameter than the rod 17 is secured to the end of the rod, VBetween these caps 18 and the casing of the base 10 springs 19 are providedwhich-tend to resist depression of the switches. Conveniently, the spring's19 are housed individually in guides or c asings 20 for the rods 17 and bear atrtheir lower end against the latter and. at their Lipper end against a pin 21 carried by the rod 17 of the switch to which theyarc appropriated. The rods 17 are preferably insu` lated from the material of the base by washers 22, while the lcasings are'carried on an insulating plate 23.

vAlso within the base 10 of the instrument are a ringing `bar 24 and a speaking bar 25. The former is carried from the upper part ot the casing of the Vbase by a series of downwardly projecting studs 26 andthe speaking` bar is situated between the ringing` bar andthe upper part of the casing 10, being itsel'r" also supported by the said studs 26. Both the ringing and the speaking bars are circular or arcuate in shape to corres,- pond with the arrangement of the selector switches andthey are so arranged that it is possible to depress any of the switches into Contact being perforated at 27 to permit the switches to pass through it to reach the ringing bar. During and by reason of passage of a switch through the speaking bar to reach the ring;v ing bar the'speaking bar is moved endwise by the switch to bring an appropriate perforation in the speaking bar into valignment with the switch, the conical end 18 of the latter effecting this movement of the speak ing bar. This movement of the speaking bar, however, is resisted by a spring 28 with the result that when the conical cap 18 on the end of the switch has passed completely through the speaking bar the latter is moved back into position with itspe'rlorationA out of alignment with the switch; hence complete return of that switch to its raised position is prevented since the base o1 the conical cap 18 being flat cannot move the speaking bar to pass through the perforation therein. rlhe switch will thus be held in contact with the speaking bar but out of Contact with the ringing bar. -The spring .28 is attached at one end to the speaking bar and at lthe other end` to a pillar 29 suitably mounted in the base 10. To make eiiicient contact with the ringing bar 24, the lower end of the switches 16 are preferably provided with Contact points 30.

with either bar, the speaking bar- Topermit of the aforesaid circular move- Dment of the speaking bar25 the studs 26 supporting it are arranged on either side of it and are provided with flanges or reduced portions to form shoulders 31 between which the speaking bar is 'received and by which` the bar is prevented Yfrom vertical displace.- ment. Conveniently also the speaking bar may be out away'as at 32 for a portion or" its side surfaces opposite each stud, such cut away portion being of sufficient length only to permit of the necessary movement to bring the perforations 27 in the speaking bar into and out of alignment with' the Vselector switches but not sui'licient to permit 01"' any excessive circular movement or the I bar. Thestuds 26 are preferably. insulated from thebase 10 by washers 33 and from the ringing bar by bushes 84. n A selector switch when oncev depressed can only be returned completely to its raised position by circular movement ot the speaking bar suliicient to bring the appropriate perf foration in the latter into alignment with the conical cap 18 on the switch. This move` ment of the speaking bar may be eiiected by the' depression of one of' the other selector switchesor, according to a feature of the present invention, it may be effected by a clearing plunger 35 which may be precisely similar in mechanical construction and operation to the selector switches 16, but it will not, however, like them be connected to the wiring system of the telephone.

The induction coil, the impedance coil and the buzzer are not intended to be mounted inside the base 10 or the instrument as this would make the latter too bulky. rl`hey'are, however, intended to be housed in a suitable case which may be secured on a wall or on a table or in another situation handy to the telephone instrument. f

The wiring of the system may be of well'- known character. For example'there may be five contacts 36, 37, 38, 39 and l40 inside the standard 11 adjacent the lever 13 on Vwhich the receiver is hung.

36, 37' and 38 are situa-ted on movable contact 39 on the other side oi which is the single contact 40( The mov-- able contact 39 is operated by the lever 13. When the receiver 15 isresting on its hook, the contact 39 bears against the contact 40, and when the refeiver is off 'its hook the Contact 39 is coupled yto the contacts 36, 37 and 38, and also maintains them in coinmunication with each other. which shows the wiring for two instruments in a siX instrument set, the wiring for instrument No.v 1 'being shown at the left hand side of this ligure and the wiring for instrument No. 2 being shown at the right hand side of this indicated kat 41 and coils at 45 and 46 and The contacts' one side of a' In Figurer 4,.

figure. the buzzers are the induction coils at 51 and 52.1 There are main leads 100, 200, 300, 400, 50()v and A60() allocated respectively to instruments Nos.

1-6 and connected tol the Vmovable contacts 39k in the standards 11 of those instruments, and also connected to the'corresponding selector switch 16 in every other instrument in the set. rhat is to say the main lead 100 which is allocated to instrument No. 1 is connected to the movable Contact 39 in'that instrument and to the selector switch numbered 1 7 in instruments Nos.`.2-6. There are also main leads 47, 48, 49 and 50. The lead 47 is connected to the ringing bar 24 of each instrument and to one pole of the batteryf44. rlhe lead 48 is connected to the buzzer of each instrument and totheother pole of the battery'44. Y

The lead 49.is connected to the impedance coil or" each instrument and to one pole of the battery 43 and the lead 50 is connected to the induction coil Oi' each instrument and Ito the other lead of the battery 43. Vihe impedance coil for each instrument is also connected to the contact 36 in the standard 11 ot its instrument, and the buzzer for each instrument is also connected to the contact 4()v in the standard 11 f that it is perforated `the present invention there is of its instrument. The speakingbar in each instrument is connected to the contact 37 in its instrument and the transmitter 12 in each instrument is connected on the one hand to `the induction coil of its instrumentand on the other hand to the contact .33 of its instrument. Y

Thus, if an operator at instrument No. 1 wishes to speak to instrument No. 2 he will depress the switch on his instrument into contact with the ringing bar 24. The circuit will then-ber16 (the 47, er, is, as, ao, a9, 20o, and back to ie.

When the operator releases his nger from the switch it moves up automatically into contact with the speaking bar 25. Both operators having lifted their receivers from the hooks a speaking circuit is established as follows :-16 (the No. 2 switch on No. 1 instrument), 25, 37, 38, 12, 51, 50, 43, 49, 46, 36 (No. 2 instrument), 39, 200 and back to 16, with a shunt circuit through 49, 46, 36 (No. 2 instrument), 38, 12, 52, 5() and 43 and back to 49. It will be appreciated that the wiring and operation of this telephone` course, that 16 numbered 2? No. 2 switch on No. 1 instrument), 24

surface 'of its the clearing plunger aforesaid. The Aapparatus according to the invention is there-l ore'very neat yin appearance, occupies the minimum of' space on projecting through the upper y base are selector switches and` the table top and is simple and cheap to manufacture, while bev ing easy of access in case repair or adjustment is needed.

.'What we claim as our inventions-nd de-p-f sire to secure by LetterPatent is zf 1. v:in an intercommunication table or desk telephone oithe' candlestick type, the combination with a cylindricalcasing constituting the base oii the vinstrument with one-endrwall at thebottom' thereof, a plurality. ot pairs of studs arrangedin said casing in twoparallel arcuate rows mounted on thc upper' end wall oiifthe casing, an `arcuate ringing bar mounted on but insulated irom saidy studs, a, Aspring controlled arcuate speaking bar carried slidable'endwise arcuately by sail studs between the ringing bar Y and the upper wall of the casing and dis- 1 posed parallel with the ringing bar, said speaking bar having a pluralityl of perforations arranged in an arcuate rrow along the same, and a plurality of spring-controlled Contact devices in the form of plungers insulated one from another, movable endwise in the upper end wall ot the casing andV having each at its inner end a shouldered head, each of which heads is adapted to engage said speaking bar in one of said perkiorations and thereby slide the bar endwise,

and is adapted to pass through its allotted perforation and contactwith said ringing bar and to at the shoulder. Y

2. In an intercommunication table or desk. telephone ot they Candlestick type, thev be engaged by the speaking bar combination with a cylindrical casing conp stituting the base of' the instrument with ,Y

one end wall at the bottom thereof, a plurality of pairs ci` studs arranged 1n said casing in two parallel arcuate rows mounted onjthe j upper end wall ringing bar mounted on but insulated from said studs, a spring-controlled arcuate speaking bar carried slidable endwise by said studs between the ringing bar and the upper wall of the casing and disposed parallelwith the ringing bar, said speaking bar having a plurality ot pertorations arranged in an arcuate row along the same, and a pluot the casing, anarcuate rality or contact `devices in the form of plungers insulated one from another, each Y ot which contact devices comprises a stem, extending through the upper wall ot said casing, a downwardly-directed tapered head constituting a shoulder at the inner end of the stem, a guide for eachstem mounted on' the underside of the upper wall of `the casing, and a coil-spring having one end abutting against the guide and its other end enbar endwise, and to pass through its allotted' Y perforation and Contact with bar and to be engaged by the vspeaking bar at'the shoulder of the head.A Y .f 1

3.7111 an intereommunication table or desk telephone of the Candlestick type, the

combination with a Cylindrical easing conetituting the base of the instrument/with one end wall at thebottom Y of the same pair, a spring-controlled arhereof, a plurality of pairs of Studs arranged in saideaslng in two parallel arcuate rows mounted on the upper end Wall of the easing, ringing bar mounted on an arcuate reeessbetween said ringing bar and the upper end wall of the casing, the recessin one stud faoingthe recess 1n the vopposite stud said ringingy but insulated from( saidstuds, each stud having a horizontal ouate speaking bar'carried in the recesses of said studs and disposed parallel with the ringing bar, said speaking bar having means l.

ior engaging the studsl and thereby limiting its endwise having ak plurality of perforations arranged in an arcuate row along the same, and a plurality of spring-controlled Contact devices V:in the form ont? plungers insulatedone from another, movable endwise inthe upper end Waller the casing'and having each at its inner end a shouldered head, each of which heads is adapted to bar in one of said perorations and thereby slide the bar endwise, and is adapted to pass through its allotted perforation and Contact with said ringing the Speaking bar at the :shoulder of the head.

ln testimony whereof wehavve signed our names to this speeiiieation.

' VJOSEPH KAY.

JOHN JENNINGS.

movement in the recesses, and

engage said speakingv bar and to be engaged by 

